Abstract
Submarine canyons are geomorphologic lineaments engraving the slope/outer shelf of continental margins. These features are often associated with significant geologic hazard when they develop close to densely populated coastal zones. The seafloor of Naples Bay is deeply cut by two incisions characterized by a dense network of gullies, namely the Dohrn and Magnaghi canyons, which develop from the shelf break of the Campania margin, down to the peripheral rise of the Eastern Tyrrhenian bathyal plain. Seismic-stratigraphic interpretation of multichannel seismic reflection profiles has shown that quaternary tectonics and recent to active volcanism have exerted a significant control on the morphological evolution and source-to sink depositional processes of the Dohrn and Magnaghi submarine canyons. The Dohrn canyon is characterized by relatively steep walls hundreds of meters high, which incise a Middle-Late Pleistocene prograding wedge, formed by clastic and volcaniclastic deposits associated with the paleo-Sarno river system during the Mid-Late Pleistocene. The formation of the Dohrn canyon predates the onset of the volcanic eruption of the Neapolitan Yellow Tuff (NYT), an ignimbrite deposit of ca. 15 ka that represents the bedrock on which the town of Napoli is built. Integrated stratigraphic analysis of high-resolution seismic profiles and marine gravity core data (C74_12) collected along the flanks of the eastern bifurcation of the head of Dohrn Canyon suggests that depositional processes along the canyon flanks are dominated by gravity flows (e.g., fine-grained turbidites, debris flows) and sediment mass transport associated with slope instability and failure.
Highlights
The continental slope and outer shelf of the Naples Bay are deeply cut by two submarine incisions—the Dohrn and the Magnaghi canyons—that form a large drainage system of this coastal marine area during the Late Quaternary
The aim of this research is to provide a contribution toward the understanding of depositional and erosional processes along a major canyon system developing on a tectonically active continental margin, associated with active volcanism, during the Geosciences 2020, 10, 319; doi:10.3390/geosciences10080319
We present an integrated stratigraphic study of geophysical and geological data acquired in the area of the Dohrn Canyon along the continental slope of the Naples Bay
Summary
The continental slope and outer shelf of the Naples Bay are deeply cut by two submarine incisions—the Dohrn and the Magnaghi canyons—that form a large drainage system of this coastal marine area during the Late Quaternary. A Neogene-Quaternary extensional domain that includes small areas floored with oceanic-type crust. Canyons and gullies are major components of continental slope morphology, as they represent a critical link between coastal waters and abyssal depths, by transferring sediments, nutrients and even litter and pollutants into deep-water settings. The aim of this research is to provide a contribution toward the understanding of depositional and erosional processes along a major canyon system developing on a tectonically active continental margin, associated with active volcanism, during the Geosciences 2020, 10, 319; doi:10.3390/geosciences10080319 www.mdpi.com/journal/geosciences. Active volcanic districts along the coasts of the Naples Bay are represented by Somma-Vesuvius and Campi Flegrei, including Ischia and Procida Islands
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